05+ Tacoma leaf springs difference?

Wondering if the overload leaf spring that originally came on my 06 Tacoma 4x4 is different ( thickness, stronger) than the new overload that comes in the TSB pack? Was thinking of installing the original overload to get a bit more flex when I am loaded with camping gear. I just re installed the new overload leaf into the pack and it feels to stiff.

 

Leafs are all the same from 05 even to the current turd gen. Doesn’t matter what pack you have (3 or 3+1) they will all sag eventually.

 

My question is more of the overload leaf when it comes into play. I loved how my rear would flex without it , but with weight I bottom out easily. I'm forced to put it back in. So before I buy one, I would like to know which of the 2 would give me more flex ( original overload or the tsb)